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Appendix III: Debentures and Bonds - Maturity (Details)
€ in Millions, £ in Millions, S/ in Millions, R$ in Millions, $ in Millions, $ in Millions, $ in Millions
Dec. 31, 2023
EUR (€)
Dec. 31, 2023
BRL (R$)
Dec. 31, 2023
COP ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
GBP (£)
Dec. 31, 2023
CLP ($)
Dec. 31, 2023
PEN (S/)
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds € 29,779            
2024              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,144            
2025              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 3,135            
2026              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 2,105            
2027              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 3,919            
2028              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 2,110            
Subsequent years              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 17,366            
Spain              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 26,641            
Spain | 2024              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,000            
Spain | 2025              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 2,019            
Spain | 2026              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,854            
Spain | 2027              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 3,381            
Spain | 2028              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,950            
Spain | Subsequent years              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 16,437            
Spain | Telefonica Europe, B.V.              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,609            
Spain | Telefonica Europe, B.V. | T. EUROPE BV SEP_00 BOND GLOBAL D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       $ 1,109      
Spain | Telefonica Europe, B.V. | TEBV FEB_03 EMTN FIXED TRANCHE B              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 500            
Spain | Telefonica Europe, B.V. | 2024              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefonica Europe, B.V. | 2024 | T. EUROPE BV SEP_00 BOND GLOBAL D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefonica Europe, B.V. | 2024 | TEBV FEB_03 EMTN FIXED TRANCHE B              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefonica Europe, B.V. | 2025              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefonica Europe, B.V. | 2025 | T. EUROPE BV SEP_00 BOND GLOBAL D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefonica Europe, B.V. | 2025 | TEBV FEB_03 EMTN FIXED TRANCHE B              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefonica Europe, B.V. | 2026              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefonica Europe, B.V. | 2026 | T. EUROPE BV SEP_00 BOND GLOBAL D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefonica Europe, B.V. | 2026 | TEBV FEB_03 EMTN FIXED TRANCHE B              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefonica Europe, B.V. | 2027              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefonica Europe, B.V. | 2027 | T. EUROPE BV SEP_00 BOND GLOBAL D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefonica Europe, B.V. | 2027 | TEBV FEB_03 EMTN FIXED TRANCHE B              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefonica Europe, B.V. | 2028              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefonica Europe, B.V. | 2028 | T. EUROPE BV SEP_00 BOND GLOBAL D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefonica Europe, B.V. | 2028 | TEBV FEB_03 EMTN FIXED TRANCHE B              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefonica Europe, B.V. | Subsequent years              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,609            
Spain | Telefonica Europe, B.V. | Subsequent years | T. EUROPE BV SEP_00 BOND GLOBAL D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       $ 1,109      
Spain | Telefonica Europe, B.V. | Subsequent years | TEBV FEB_03 EMTN FIXED TRANCHE B              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds € 500            
Spain | Telefonica Europe, B.V. | Fixed interest rate | T. EUROPE BV SEP_00 BOND GLOBAL D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 8.25% 8.25% 8.25% 8.25% 8.25% 8.25% 8.25%
Spain | Telefonica Europe, B.V. | Fixed interest rate | TEBV FEB_03 EMTN FIXED TRANCHE B              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 5.875% 5.875% 5.875% 5.875% 5.875% 5.875% 5.875%
Spain | Telefónica Emisiones, S.A.U.              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds € 25,032            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES FEBRUARY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,000            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,127            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES SEPTEMBER 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £         £ 892    
Spain | Telefónica Emisiones, S.A.U. | EMTN O2 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 575            
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES APRIL 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,279            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES JANUARY 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       $ 1,000      
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES MARCH 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,131            
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,250            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 500            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES SEPTEMBER 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,250            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES MARCH 2017 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 200            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £         1,000    
Spain | Telefónica Emisiones, S.A.U. | EMTN GBP 10/08/2029 400 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 460            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES OCTOBER 2014              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 800            
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES FEBRUARY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,000            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES MAY 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,000            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES OCTOBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 750            
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       750      
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES JUNE 06 TRANCHE D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       1,810      
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES APRIL 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       181      
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES MARCH 2018 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 453            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES JULY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 500            
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES JULY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 500            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES APRIL 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       100      
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES MARCH 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       1,810      
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES APRIL 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       452      
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES MARCH 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       1,131      
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,131            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES DECEMBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 150            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES NOVEMBER 2023.1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 850            
Spain | Telefónica Emisiones, S.A.U. | 2024              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,000            
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF. EMISIONES FEBRUARY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,000            
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF. EMISIONES SEPTEMBER 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £         0    
Spain | Telefónica Emisiones, S.A.U. | 2024 | EMTN O2 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF EMISIONES APRIL 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF. EMISIONES JANUARY 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF. EMISIONES MARCH 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF. EMISIONES SEPTEMBER 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF. EMISIONES MARCH 2017 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £         0    
Spain | Telefónica Emisiones, S.A.U. | 2024 | EMTN GBP 10/08/2029 400 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF. EMISIONES OCTOBER 2014              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF EMISIONES FEBRUARY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF. EMISIONES MAY 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF. EMISIONES OCTOBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF EMISIONES JUNE 06 TRANCHE D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF. EMISIONES APRIL 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF. EMISIONES MARCH 2018 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF. EMISIONES JULY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF EMISIONES JULY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF. EMISIONES APRIL 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF. EMISIONES MARCH 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF. EMISIONES APRIL 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF. EMISIONES MARCH 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF. EMISIONES DECEMBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2024 | TELEF. EMISIONES NOVEMBER 2023.1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2025              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 2,019            
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF. EMISIONES FEBRUARY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,127            
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF. EMISIONES SEPTEMBER 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £         892    
Spain | Telefónica Emisiones, S.A.U. | 2025 | EMTN O2 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF EMISIONES APRIL 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF. EMISIONES JANUARY 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF. EMISIONES MARCH 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF. EMISIONES SEPTEMBER 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF. EMISIONES MARCH 2017 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £         0    
Spain | Telefónica Emisiones, S.A.U. | 2025 | EMTN GBP 10/08/2029 400 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF. EMISIONES OCTOBER 2014              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF EMISIONES FEBRUARY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF. EMISIONES MAY 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF. EMISIONES OCTOBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF EMISIONES JUNE 06 TRANCHE D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF. EMISIONES APRIL 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF. EMISIONES MARCH 2018 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF. EMISIONES JULY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF EMISIONES JULY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF. EMISIONES APRIL 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF. EMISIONES MARCH 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF. EMISIONES APRIL 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF. EMISIONES MARCH 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF. EMISIONES DECEMBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2025 | TELEF. EMISIONES NOVEMBER 2023.1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,854            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES FEBRUARY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES SEPTEMBER 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £         0    
Spain | Telefónica Emisiones, S.A.U. | 2026 | EMTN O2 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 575            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF EMISIONES APRIL 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,279            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES JANUARY 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES MARCH 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES SEPTEMBER 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES MARCH 2017 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £         0    
Spain | Telefónica Emisiones, S.A.U. | 2026 | EMTN GBP 10/08/2029 400 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES OCTOBER 2014              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF EMISIONES FEBRUARY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES MAY 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES OCTOBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF EMISIONES JUNE 06 TRANCHE D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES APRIL 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES MARCH 2018 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES JULY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF EMISIONES JULY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES APRIL 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES MARCH 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES APRIL 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES MARCH 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES DECEMBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES NOVEMBER 2023.1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 3,381            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES FEBRUARY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES SEPTEMBER 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £         0    
Spain | Telefónica Emisiones, S.A.U. | 2027 | EMTN O2 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF EMISIONES APRIL 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES JANUARY 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       1,000      
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES MARCH 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,131            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,250            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES SEPTEMBER 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES MARCH 2017 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £         0    
Spain | Telefónica Emisiones, S.A.U. | 2027 | EMTN GBP 10/08/2029 400 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES OCTOBER 2014              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF EMISIONES FEBRUARY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES MAY 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES OCTOBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF EMISIONES JUNE 06 TRANCHE D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES APRIL 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES MARCH 2018 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES JULY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF EMISIONES JULY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES APRIL 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES MARCH 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES APRIL 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES MARCH 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES DECEMBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES NOVEMBER 2023.1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,950            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES FEBRUARY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES SEPTEMBER 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £         0    
Spain | Telefónica Emisiones, S.A.U. | 2028 | EMTN O2 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF EMISIONES APRIL 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES JANUARY 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES MARCH 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 500            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES SEPTEMBER 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,250            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES MARCH 2017 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 200            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £         0    
Spain | Telefónica Emisiones, S.A.U. | 2028 | EMTN GBP 10/08/2029 400 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES OCTOBER 2014              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF EMISIONES FEBRUARY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES MAY 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES OCTOBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF EMISIONES JUNE 06 TRANCHE D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES APRIL 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES MARCH 2018 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES JULY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF EMISIONES JULY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES APRIL 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES MARCH 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES APRIL 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES MARCH 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES DECEMBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES NOVEMBER 2023.1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 14,828            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES FEBRUARY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES SEPTEMBER 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £         0    
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | EMTN O2 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF EMISIONES APRIL 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES JANUARY 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES MARCH 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES SEPTEMBER 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES MARCH 2017 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £         £ 1,000    
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | EMTN GBP 10/08/2029 400 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 460            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES OCTOBER 2014              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 800            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF EMISIONES FEBRUARY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,000            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES MAY 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,000            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES OCTOBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 750            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       750      
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF EMISIONES JUNE 06 TRANCHE D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       1,810      
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES APRIL 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       181      
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES MARCH 2018 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 453            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES JULY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 500            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF EMISIONES JULY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 500            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES APRIL 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       100      
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES MARCH 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       1,810      
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES APRIL 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       452      
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES MARCH 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       $ 1,131      
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,131            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES DECEMBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 150            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES NOVEMBER 2023.1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds € 850            
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES FEBRUARY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.069% 1.069% 1.069% 1.069% 1.069% 1.069% 1.069%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.528% 1.528% 1.528% 1.528% 1.528% 1.528% 1.528%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES SEPTEMBER 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.495% 1.495% 1.495% 1.495% 1.495% 1.495% 1.495%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | EMTN O2 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 5.375% 5.375% 5.375% 5.375% 5.375% 5.375% 5.375%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF EMISIONES APRIL 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.46% 1.46% 1.46% 1.46% 1.46% 1.46% 1.46%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES JANUARY 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.447% 1.447% 1.447% 1.447% 1.447% 1.447% 1.447%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES MARCH 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 4.103% 4.103% 4.103% 4.103% 4.103% 4.103% 4.103%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.201% 1.201% 1.201% 1.201% 1.201% 1.201% 1.201%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 2.318% 2.318% 2.318% 2.318% 2.318% 2.318% 2.318%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES SEPTEMBER 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.715% 1.715% 1.715% 1.715% 1.715% 1.715% 1.715%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES MARCH 2017 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 2.318% 2.318% 2.318% 2.318% 2.318% 2.318% 2.318%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.788% 1.788% 1.788% 1.788% 1.788% 1.788% 1.788%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | EMTN GBP 10/08/2029 400 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 5.445% 5.445% 5.445% 5.445% 5.445% 5.445% 5.445%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES OCTOBER 2014              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 2.932% 2.932% 2.932% 2.932% 2.932% 2.932% 2.932%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF EMISIONES FEBRUARY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 0.664% 0.664% 0.664% 0.664% 0.664% 0.664% 0.664%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES MAY 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 2.592% 2.592% 2.592% 2.592% 2.592% 2.592% 2.592%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES OCTOBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.93% 1.93% 1.93% 1.93% 1.93% 1.93% 1.93%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.807% 1.807% 1.807% 1.807% 1.807% 1.807% 1.807%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF EMISIONES JUNE 06 TRANCHE D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 7.045% 7.045% 7.045% 7.045% 7.045% 7.045% 7.045%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES APRIL 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 4.90% 4.90% 4.90% 4.90% 4.90% 4.90% 4.90%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES MARCH 2018 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 4.665% 4.665% 4.665% 4.665% 4.665% 4.665% 4.665%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES JULY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.957% 1.957% 1.957% 1.957% 1.957% 1.957% 1.957%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF EMISIONES JULY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.864% 1.864% 1.864% 1.864% 1.864% 1.864% 1.864%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES APRIL 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.864% 1.864% 1.864% 1.864% 1.864% 1.864% 1.864%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES MARCH 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 5.213% 5.213% 5.213% 5.213% 5.213% 5.213% 5.213%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES APRIL 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 5.213% 5.213% 5.213% 5.213% 5.213% 5.213% 5.213%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES MARCH 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 4.895% 4.895% 4.895% 4.895% 4.895% 4.895% 4.895%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 5.52% 5.52% 5.52% 5.52% 5.52% 5.52% 5.52%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES DECEMBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 4.00% 4.00% 4.00% 4.00% 4.00% 4.00% 4.00%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES NOVEMBER 2023.1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 4.183% 4.183% 4.183% 4.183% 4.183% 4.183% 4.183%
Outside of Parent Country              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds € 3,138            
Outside of Parent Country | 2024              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 144            
Outside of Parent Country | 2025              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,116            
Outside of Parent Country | 2026              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 251            
Outside of Parent Country | 2027              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 538            
Outside of Parent Country | 2028              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 160            
Outside of Parent Country | Subsequent years              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 929            
Outside of Parent Country | Telefónica Móviles Chile, S.A.              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 700            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Bond Serie T              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 112            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Bond O              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $           $ 72  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Bond Q              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $           93  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Bond 144 A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       $ 423      
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2024              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2024 | Bond Serie T              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2024 | Bond O              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $           0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2024 | Bond Q              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $           0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2024 | Bond 144 A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2025              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 72            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2025 | Bond Serie T              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2025 | Bond O              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $           72  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2025 | Bond Q              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $           0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2025 | Bond 144 A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2026              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 93            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2026 | Bond Serie T              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2026 | Bond O              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $           0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2026 | Bond Q              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $           93  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2026 | Bond 144 A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2027              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2027 | Bond Serie T              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2027 | Bond O              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $           0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2027 | Bond Q              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $           0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2027 | Bond 144 A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2028              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 112            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2028 | Bond Serie T              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 112            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2028 | Bond O              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $           0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2028 | Bond Q              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $           0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2028 | Bond 144 A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Subsequent years              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 423            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Subsequent years | Bond Serie T              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds € 0            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Subsequent years | Bond O              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $           0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Subsequent years | Bond Q              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $           $ 0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Subsequent years | Bond 144 A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       $ 423      
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Fixed interest rate | Bond Serie T              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 4.20% 4.20% 4.20% 4.20% 4.20% 4.20% 4.20%
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Fixed interest rate | Bond O              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 3.50% 3.50% 3.50% 3.50% 3.50% 3.50% 3.50%
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Fixed interest rate | Bond Q              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 3.60% 3.60% 3.60% 3.60% 3.60% 3.60% 3.60%
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Fixed interest rate | Bond 144 A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 3.537% 3.537% 3.537% 3.537% 3.537% 3.537% 3.537%
Outside of Parent Country | Telefónica del Perú, S.A.              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             S/ 614
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 4th Program (19th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             26
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 4th Program (19th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             20
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 4th Program (37th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             20
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 4th Program (19th Serie C)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             8
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 6th Program (17th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             18
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 6th Program (11th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             29
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 6th Program (15th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             33
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 6th Program (16th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             26
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 1st Private Program (1st Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             20
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 1st Program International Issue (1sr Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             414
Outside of Parent Country | Telefónica del Perú, S.A. | 2024              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             62
Outside of Parent Country | Telefónica del Perú, S.A. | 2024 | Bond T. Peru 4th Program (19th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2024 | Bond T. Peru 4th Program (19th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2024 | Bond T. Peru 4th Program (37th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2024 | Bond T. Peru 4th Program (19th Serie C)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2024 | Bond T. Peru 6th Program (17th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2024 | Bond T. Peru 6th Program (11th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             29
Outside of Parent Country | Telefónica del Perú, S.A. | 2024 | Bond T. Peru 6th Program (15th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             33
Outside of Parent Country | Telefónica del Perú, S.A. | 2024 | Bond T. Peru 6th Program (16th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2024 | Bond T. Peru 1st Private Program (1st Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2024 | Bond T. Peru 1st Program International Issue (1sr Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2025              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             164
Outside of Parent Country | Telefónica del Perú, S.A. | 2025 | Bond T. Peru 4th Program (19th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2025 | Bond T. Peru 4th Program (19th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2025 | Bond T. Peru 4th Program (37th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2025 | Bond T. Peru 4th Program (19th Serie C)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2025 | Bond T. Peru 6th Program (17th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2025 | Bond T. Peru 6th Program (11th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2025 | Bond T. Peru 6th Program (15th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2025 | Bond T. Peru 6th Program (16th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             26
Outside of Parent Country | Telefónica del Perú, S.A. | 2025 | Bond T. Peru 1st Private Program (1st Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2025 | Bond T. Peru 1st Program International Issue (1sr Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             138
Outside of Parent Country | Telefónica del Perú, S.A. | 2026              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             158
Outside of Parent Country | Telefónica del Perú, S.A. | 2026 | Bond T. Peru 4th Program (19th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2026 | Bond T. Peru 4th Program (19th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2026 | Bond T. Peru 4th Program (37th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2026 | Bond T. Peru 4th Program (19th Serie C)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2026 | Bond T. Peru 6th Program (17th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2026 | Bond T. Peru 6th Program (11th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2026 | Bond T. Peru 6th Program (15th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2026 | Bond T. Peru 6th Program (16th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2026 | Bond T. Peru 1st Private Program (1st Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             20
Outside of Parent Country | Telefónica del Perú, S.A. | 2026 | Bond T. Peru 1st Program International Issue (1sr Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             138
Outside of Parent Country | Telefónica del Perú, S.A. | 2027              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             164
Outside of Parent Country | Telefónica del Perú, S.A. | 2027 | Bond T. Peru 4th Program (19th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             26
Outside of Parent Country | Telefónica del Perú, S.A. | 2027 | Bond T. Peru 4th Program (19th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2027 | Bond T. Peru 4th Program (37th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2027 | Bond T. Peru 4th Program (19th Serie C)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2027 | Bond T. Peru 6th Program (17th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2027 | Bond T. Peru 6th Program (11th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2027 | Bond T. Peru 6th Program (15th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2027 | Bond T. Peru 6th Program (16th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2027 | Bond T. Peru 1st Private Program (1st Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2027 | Bond T. Peru 1st Program International Issue (1sr Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             138
Outside of Parent Country | Telefónica del Perú, S.A. | 2028              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             48
Outside of Parent Country | Telefónica del Perú, S.A. | 2028 | Bond T. Peru 4th Program (19th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2028 | Bond T. Peru 4th Program (19th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             20
Outside of Parent Country | Telefónica del Perú, S.A. | 2028 | Bond T. Peru 4th Program (37th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             20
Outside of Parent Country | Telefónica del Perú, S.A. | 2028 | Bond T. Peru 4th Program (19th Serie C)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             8
Outside of Parent Country | Telefónica del Perú, S.A. | 2028 | Bond T. Peru 6th Program (17th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2028 | Bond T. Peru 6th Program (11th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2028 | Bond T. Peru 6th Program (15th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2028 | Bond T. Peru 6th Program (16th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2028 | Bond T. Peru 1st Private Program (1st Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | 2028 | Bond T. Peru 1st Program International Issue (1sr Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             18
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 4th Program (19th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 4th Program (19th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 4th Program (37th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 4th Program (19th Serie C)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 6th Program (17th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             18
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 6th Program (11th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 6th Program (15th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 6th Program (16th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 1st Private Program (1st Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             0
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 1st Program International Issue (1sr Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/             S/ 0
Outside of Parent Country | Telefónica del Perú, S.A. | Fixed interest rate | Bond T. Peru 6th Program (11th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 6.188% 6.188% 6.188% 6.188% 6.188% 6.188% 6.188%
Outside of Parent Country | Telefónica del Perú, S.A. | Fixed interest rate | Bond T. Peru 6th Program (15th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 5.469% 5.469% 5.469% 5.469% 5.469% 5.469% 5.469%
Outside of Parent Country | Telefónica del Perú, S.A. | Fixed interest rate | Bond T. Peru 6th Program (16th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Outside of Parent Country | Telefónica del Perú, S.A. | Fixed interest rate | Bond T. Peru 1st Private Program (1st Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 7.281% 7.281% 7.281% 7.281% 7.281% 7.281% 7.281%
Outside of Parent Country | Telefónica del Perú, S.A. | Fixed interest rate | Bond T. Peru 1st Program International Issue (1sr Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 7.375% 7.375% 7.375% 7.375% 7.375% 7.375% 7.375%
Outside of Parent Country | Telefónica del Perú, S.A. | Floating interest rate | Bond T. Peru 4th Program (19th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 3.625% 3.625% 3.625% 3.625% 3.625% 3.625% 3.625%
Outside of Parent Country | Telefónica del Perú, S.A. | Floating interest rate | Bond T. Peru 4th Program (19th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 2.875% 2.875% 2.875% 2.875% 2.875% 2.875% 2.875%
Outside of Parent Country | Telefónica del Perú, S.A. | Floating interest rate | Bond T. Peru 4th Program (37th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 3.125% 3.125% 3.125% 3.125% 3.125% 3.125% 3.125%
Outside of Parent Country | Telefónica del Perú, S.A. | Floating interest rate | Bond T. Peru 4th Program (19th Serie C)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 3.1875% 3.1875% 3.1875% 3.1875% 3.1875% 3.1875% 3.1875%
Outside of Parent Country | Telefónica del Perú, S.A. | Floating interest rate | Bond T. Peru 6th Program (17th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 3.0938% 3.0938% 3.0938% 3.0938% 3.0938% 3.0938% 3.0938%
Outside of Parent Country | Telefônica Brasil, S.A.              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$   R$ 654          
Outside of Parent Country | Telefônica Brasil, S.A. | Debentures 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$   280          
Outside of Parent Country | Telefônica Brasil, S.A. | Debentures 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$   374          
Outside of Parent Country | Telefônica Brasil, S.A. | 2024              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$   0          
Outside of Parent Country | Telefônica Brasil, S.A. | 2024 | Debentures 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$   0          
Outside of Parent Country | Telefônica Brasil, S.A. | 2024 | Debentures 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$   0          
Outside of Parent Country | Telefônica Brasil, S.A. | 2025              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$   280          
Outside of Parent Country | Telefônica Brasil, S.A. | 2025 | Debentures 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$   280          
Outside of Parent Country | Telefônica Brasil, S.A. | 2025 | Debentures 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$   0          
Outside of Parent Country | Telefônica Brasil, S.A. | 2026              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$   0          
Outside of Parent Country | Telefônica Brasil, S.A. | 2026 | Debentures 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$   0          
Outside of Parent Country | Telefônica Brasil, S.A. | 2026 | Debentures 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$   0          
Outside of Parent Country | Telefônica Brasil, S.A. | 2027              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$   374          
Outside of Parent Country | Telefônica Brasil, S.A. | 2027 | Debentures 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$   0          
Outside of Parent Country | Telefônica Brasil, S.A. | 2027 | Debentures 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$   374          
Outside of Parent Country | Telefônica Brasil, S.A. | 2028              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$   0          
Outside of Parent Country | Telefônica Brasil, S.A. | 2028 | Debentures 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$   0          
Outside of Parent Country | Telefônica Brasil, S.A. | 2028 | Debentures 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$   0          
Outside of Parent Country | Telefônica Brasil, S.A. | Subsequent years              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$   0          
Outside of Parent Country | Telefônica Brasil, S.A. | Subsequent years | Debentures 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$   0          
Outside of Parent Country | Telefônica Brasil, S.A. | Subsequent years | Debentures 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$   R$ 0          
Outside of Parent Country | Telefônica Brasil, S.A. | Floating interest rate | Debentures 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.12% 1.12% 1.12% 1.12% 1.12% 1.12% 1.12%
Outside of Parent Country | Telefônica Brasil, S.A. | Floating interest rate | Debentures 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.35% 1.35% 1.35% 1.35% 1.35% 1.35% 1.35%
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P.              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds € 570            
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | BOND R144-A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       $ 452      
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | Bond A5              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $     $ 82        
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | Bond C10              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $     36        
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | 2024              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 82            
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | 2024 | BOND R144-A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | 2024 | Bond A5              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $     82        
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | 2024 | Bond C10              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $     0        
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | 2025              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | 2025 | BOND R144-A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | 2025 | Bond A5              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $     0        
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | 2025 | Bond C10              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $     0        
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | 2026              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | 2026 | BOND R144-A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | 2026 | Bond A5              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $     0        
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | 2026 | Bond C10              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $     0        
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | 2027              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | 2027 | BOND R144-A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | 2027 | Bond A5              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $     0        
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | 2027 | Bond C10              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $     0        
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | 2028              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | 2028 | BOND R144-A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | 2028 | Bond A5              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $     0        
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | 2028 | Bond C10              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $     0        
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | Subsequent years              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds € 488            
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | Subsequent years | BOND R144-A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       $ 452      
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | Subsequent years | Bond A5              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $     0        
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | Subsequent years | Bond C10              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $     $ 36        
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | Fixed interest rate | BOND R144-A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 4.95% 4.95% 4.95% 4.95% 4.95% 4.95% 4.95%
Outside of Parent Country | Colombia Telecomunicaciones, S.A., E.S.P. | Fixed interest rate | Bond A5              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 6.65% 6.65% 6.65% 6.65% 6.65% 6.65% 6.65%
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds € 600            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | Bond              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 600            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | 2024              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | 2024 | Bond              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | 2025              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 600            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | 2025 | Bond              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 600            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | 2026              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | 2026 | Bond              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | 2027              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | 2027 | Bond              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | 2028              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | 2028 | Bond              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | Subsequent years              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | Subsequent years | Bond              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds € 0            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | Fixed interest rate | Bond              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.75% 1.75% 1.75% 1.75% 1.75% 1.75% 1.75%
Outside of Parent Country | Colombia Telecomunicaciones, S.A., ESP | Floating interest rate | Bond C10              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 3.39% 3.39% 3.39% 3.39% 3.39% 3.39% 3.39%